Subtracting Within 20: Finding the Difference Between Two Numbers

This video tutorial introduces subtraction as finding the difference between numbers. It explains the concept using examples with cars and highlights the importance of understanding fact families. The tutorial demonstrates how to use fact families and number lines to solve subtraction problems, emphasizing the relationship between addition and subtraction. The lesson concludes with a summary of subtracting within 20.

How do you rewrite a subtraction problem as an addition sentence?

Describe the process of finding the difference using a number line.